<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
         .box{
             margin: 100px auto;
             width:300px;
             height: 200px;
             outline: 0;
             box-shadow: 0px  0px  10px 5px rgba(143, 143, 143, .1);;
             /*-webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(143, 143, 143, .6);*/
             /*box-shadow: inset 0 1px 1px rgba(0, 0, 0, .075), 0 0 8px rgba(143, 143, 143, .6);*/
         }
    </style>
</head>
<body>
<div class="box">

</div>
</body>
</html>